Hoisting-drum for elevators



(No Model.) 2 Sheets-Sheet 1.

B. W. GRIST.

HOISTING DRUM FOR ELEVATORS.

' No. 328,934. Patented Oct. 27, 1885.

WITNESSES: w W oxm YS.

(No Model.) 2 Sheets-Sheet 2. B. W. GRIST.

HOISTING DRUM FOR ELEVATORS.

No. 328,934. Patented Oct. 2'7, 1885.

mgmmm UNITED STATES PATENT Orrics.

BENJAMIN W. GRIST, OF READING, PENNSYLVANIA.

HQISTING-DRUM FOR ELEVATORS.

EPECIPIC'ATION forming part of Letters Patent No. 328,934, dated October 27, 1885;

Application filed September 17, 1885. Serial No. 177,331. (No model.)

.To all whom it may concern:

Be it known that I, B. .W. GRIST, a citizen of the United States, residing at Reading, in the county of Berks and State of Pennsylvania, have invented certain new and useful Improvements in Hoisting-Drums for Elevators;

and I do hereby declare the following to be a fecting the raising and lowering of the loadwith safety; and to this end many devices have been devised which have been complicated in their construction, and in many instances wholly unreliable in their operation;

The object of my invention is to produce a simple, safe, durable, and reliable means for engaging and disengaging a hoisting-drum gine.

with and from a power-shaft, and to transfer the power of the driven shaft to a drum loosely mounted thereon.

The invention consists in the constructions hereinafter described, and particularly pointed out in the claims.

In the accompanying drawings, which form a part of this specification, Figure l represents a vertical longitudinal section of a hoisting-drum and friction-gear mounted upon a shaft attached to the connecting-rod of an en- Fig. 2 is an end view of the pedestal, showing the internal gear formed upon its flange and the gear-wheels which engage therewith. Fig. 3 is aside view, partly in section, of the friction-disk and its gear-wheels secured thereto. Fig. 4 is an end view looking toward the engine from the line as x.

Reference being had to the drawings and the letters of reference marked thereon, A represents a steam-engine with its connectingrod B attached to a crank, G, for converting the linear motion of the piston into rotary motion and imparting it to the shaftD.

Upon the shaft D is loosely mounted adrum, E, which is provided atone end with a disk bearing conical friction-surface F, and at the other end with a head, G, having a groove, a, formed in its circumference.

H represents a friction-disk loosely mounted The disk H is provided:

the flange K, formed upon the disk L of the pedestal'M, which supports the outer end of the shaft D, the opposite end being supported in a bearing, M, secured to the engined'rame, as shown in Fig. 1. the gear-wheels c c and d are of the same diameter, and that the latter revolves in a directionopposite to that of the former, as indicated by arrows, as shown in Fig. 2'. The diameter of the wheels 0 c and (I may, however, be varied, as circumstances may require.

Around the hub n of the drum is formed a groove, e, in which is secured a yoke, f, and to which is connected a lever, O, fulcrumed at g to an arm, P, projecting out from the engine-frame.

In the groove a, formed in the head G, is placed a band, h, one end of which is secured to a lever, z, and the other end at j to a footlever, B, fulcrumed at k, the object of which is to form a brake to arrest the motion of the revolving drum during the descent of the elevator car or bucket, and thereby control its speed, or after it has been disengaged from the friction-disk H, or to hold the drum in a fixed position when the engine is running and it is not desired to use its power for hoisting purposes.

The construction of the various parts of the machinery having been described in detail, the operation is as follows: The engine being in motion and the shaft D revolving, carrying with it the gear-Wheel (I, when the operator desires to use the hoisting-machinery he seizes the lever O and moves the drum E upon the shaft, bringing the friction-surface F on the drum into contact with the corresponding sur face, I, of the disk H, which will securely lock the drum and the disk together. The power of the engine imparted to the shaft .D is now transmitted to the drum through the medium It will be observed that Of the gear-wheel d, which is secured to the shaft and revolves with it andzthe gear-wheels c c, which engage with the wheel d and with the gear-teeth formed on the inner surface of 5 the flange K, which is a fixed part of the pedestal M. The power thus imparted by the shaft causes the gear-wheel d to turn in one direction, and the wheels 0 c, meshing with it and the fixed gear in the flange K, to revolve in the opposite direction, while the disk H and the drum are locked together by frictional contact and are made to revolve with the shaft I D. To release the drum, it ismoved away from contact with the disk H, when it will again assume its normal condition.

The operation of the brake is-obvious. The attendant, by pressing his foot upon the lever R, causes the band h to be tightened around the circumference of the head G, and thus produce friction between the band and the surface of the head, upon which it bears.

By my invention I have greatly simplified the construction of the parts forming the friction-gear as compared with similar deviceswhich have preceded it, and in which two sets of gear wheels are employed for imparting the power of theshaft to the drum.

Having thus fully'described my invention, whatsI claim is I l. The combination of a power-driven shaft, I a gear-wheel. fixed thereon, a friction-disk loosely mounted on said shaft and carrying two gear-wheels, afixed annular gear, and a friction -;sur-face adapted to be brought into contact with the disk, substantially as de- Q scribed.

2. A power-shaft having loosely mounted thereon a drum anda friction-disk, and agearwheel fixed to the shaft and revolving there- 7 0 with, in combination with two gear-wheels revolving upon axles secured in the loose disk, and a stationary gear, substantially as described.

3. A pedestal forming a bearing for a shaft and provided with a disk having a flange, upon the inner surface of which gear is formed, in combination with a drum adapted to move longitudinally upon the shaft, an interposed loose friction-disk and gearing connecting the disk with the main shaft, substantially as described.

4. The shaft D, wheel d, fixed thereon, disk H, loosely mounted on said shaft and carrying two wheels, 0 c, and the fixed flange K, provided with gear, in combination with a friction-surface adapted to be brought into contact with the disk, substantially as described.

5. The shaft D, having loosely mounted thereon a drum, E, and friction disk H, a gear-wheel, d, fixed to the shaft and revolving therewith, in combination with two gearwheels, 0 a, revolving upon axles secured in the loose disk H, and the stationary gear on the flange K, substantially as described.

6. The pedestal M, forming a bearing for 65 one end of the shaft D, and provided with 'disk L, having flange K, supplied with gearpresence of two witnesses.

BENJAMIN W. GRIST.

Witnesses JAMES R. KENNEY, L. WILLBORG. 

